package org.test.utils;

import java.security.MessageDigest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Md5Util {
	
	private static final Logger logger = LoggerFactory.getLogger(Md5Util.class);

 private static final char[] hexadecimal =
	    {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
	     'a', 'b', 'c', 'd', 'e', 'f'};


	    // --------------------------------------------------------- Public Methods


    /**
     * Encodes the 128 bit (16 bytes) MD5 into a 32 character String.
     *
     * @param binaryData Array containing the digest
     * @return Encoded MD5, or null if encoding failed
     */
    public static String encode( byte[] binaryData ) {

        if (binaryData.length != 16)
            return null;

        char[] buffer = new char[32];

        for (int i=0; i<16; i++) {
            int low = (int) (binaryData[i] & 0x0f);
            int high = (int) ((binaryData[i] & 0xf0) >> 4);
            buffer[i*2] = hexadecimal[high];
            buffer[i*2 + 1] = hexadecimal[low];
        }

        String str =  new String(buffer);
        logger.info("md5 sign:"+str);
        return str;

    }


    public static String getMD5(String string,String charset)
    {
        try
        {
            MessageDigest messageDigest = MessageDigest.getInstance("MD5");
           byte data[] =  messageDigest.digest(string.getBytes(charset));
           return encode(data);
        }
        catch (Exception e)
        {
        }
        return null;
    }
    
    public static String getMD5(String string)
    {
        try
        {
            MessageDigest messageDigest = MessageDigest.getInstance("MD5");
           byte data[] =  messageDigest.digest(string.getBytes("UTF-8"));
           return encode(data);
        }
        catch (Exception e)
        {
        }
        return null;
    }
}
